leveldown/leveldb errors

gdb

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff6bca700 (LWP 25672)]
0x00007ffff4973674 in leveldb::DecodeFixed32 (ptr=0x8 <Address 0x8 out of bounds>)
    at ../deps/leveldb/leveldb-1.14.0/util/coding.h:62
62	    memcpy(&result, ptr, sizeof(result));  // gcc optimizes this to a plain load
(gdb) backtrace 
#0  0x00007ffff4973674 in leveldb::DecodeFixed32 (ptr=0x8 <Address 0x8 out of bounds>)
    at ../deps/leveldb/leveldb-1.14.0/util/coding.h:62
#1  0x00007ffff49854f4 in leveldb::WriteBatchInternal::Count (b=0x5698930)
    at ../deps/leveldb/leveldb-1.14.0/db/write_batch.cc:83
#2  0x00007ffff498547c in leveldb::WriteBatch::Iterate (this=0x5698930, handler=0x7ffff6bc9ca0)
    at ../deps/leveldb/leveldb-1.14.0/db/write_batch.cc:75
#3  0x00007ffff4985769 in leveldb::WriteBatchInternal::InsertInto (b=0x5698930, 
    memtable=0x7fffe8003760) at ../deps/leveldb/leveldb-1.14.0/db/write_batch.cc:133
#4  0x00007ffff4965f51 in leveldb::DBImpl::Write (this=0x7fffe80008f0, options=..., 
    my_batch=0x5698930) at ../deps/leveldb/leveldb-1.14.0/db/db_impl.cc:1192
#5  0x00007ffff494f3b0 in leveldown::Database::WriteBatchToDatabase (this=0xe9e5e0, 
    options=0x5698990, batch=0x5698930) at ../src/database.cc:74
#6  0x00007ffff4948c06 in leveldown::Batch::Write (this=0x6488a70) at ../src/batch.cc:30
#7  0x00007ffff494d81c in leveldown::BatchWriteWorker::Execute (this=0x64acc20)
    at ../src/batch_async.cc:25
#8  0x00007ffff494b748 in NanAsyncExecute (req=0x64acc28) at ../node_modules/nan/nan.h:627
#9  0x00000000006ddebd in worker (arg=arg@entry=0x0) at ../deps/uv/src/unix/threadpool.c:74
#10 0x00000000006d3a0f in uv__thread_start (ctx_v=<optimised out>) at ../deps/uv/src/uv-common.c:322
#11 0x00007ffff6f9af8e in start_thread (arg=0x7ffff6bca700) at pthread_create.c:311
#12 0x00007ffff6cc4e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113